:root{--bg: #f8f9fb;--surface: #ffffff;--text: #1a2233;--muted: #5b6472;--border: #dfe3ea;--accent: #4f46e5;--accent-soft: #eef0ff;--ok: #167a3d;--ok-soft: #e7f6ec;--err: #b3261e;--err-soft: #fdecea;--radius: 12px}@media (prefers-color-scheme: dark){:root{--bg: #12151c;--surface: #1a1f29;--text: #e8eaf0;--muted: #9aa3b2;--border: #2a3140;--accent: #818cf8;--accent-soft: #232848;--ok: #4ade80;--ok-soft: #16311f;--err: #f87171;--err-soft: #3a1d1b}}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}.wrap{max-width:860px;margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--border);background:var(--surface)}.header-row{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px}.brand{font-weight:700;font-size:18px;color:var(--text);text-decoration:none}.brand-mark{color:var(--accent);font-weight:700}nav 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